Valve mechanism for door-checks.



P, NCRDQvST. VALVE MECHANISM FOR DOOR CEEOKS. APPLICATION FILED MAY 3,1910.

Patented O. 22,; 912.

2 SHEET-SHEET l.

P. E. NORDQVIST. VALVE MEGHANISM FOR DOOR CHECKS.

APPLICATION FILED MAY 3, 1910.

Patented 9ct. 22, i912.

2 SHEETS-SHEET Z.

UNITED STATES PATENT OFFICE.

PER ERIK NORDQVIST, 0F CHICAGO, ILLINOIS, ASSIGNOR TO CONCEALED DOORCH'ECY COMPANY, OF SANTA BARBARA, CALIFORNIA.

VALVE MECHANISM FOR DOOR-CHECKS.

Speccaton of Letters Patent.

Patented Oct. 22, 1912.

To alt' whmn tr' 'may concern:

Be it known that I, Per. ERIK NonDQvisr, a subject of the King ofSweden, residing at Chicago, in the county of Cook and State ofIllinois, have invented a certain new and useful Improvement in ValveMechanism for Door-Checks, of which the following is a full, clear,concise, and exact description, reference being had to the accompanyingdrawings, forming a part of this specification.

My invention relates to improvements in door check mechanisms, and itconsists in the constructions, combinations and arrange ments hereindescribed and claimed.

My invention relates particularly to an improved door check mechanismprovided with a throttling valve having anirregular surface forengagement by suitable valve-actuating means, whereby very slightmovement :of the valve will cause a change in the operation of the doorcheck to gradually vary the speed of a door throughout closing of thelatter.

Cross reference is made to applicants copending applications Serial Nos.559207, 559208, 559210, 559209, and' 559213, filed May 3, 1910, whichshow general features of construction shown but not claimed in thisapplication, and application Serial No.

559214, led May 3, 1910, which shows the irregular valve surface claimedin this application in combination with other features not shown in thiscase.

I'will describe my invention more in detailby reference to theaccompanying drawings, in which- Figure 1 is a sectional View of thelefthand portion of my improved door check; and Fig. 2 is a detail viewof the right-hand half of said door check, shown in section. Fig. 3 is adetail view of the link-connecting mechanism between the door and thecasing; and Fig. 4 isa sectional view on lines 4 4 of Fig. 2.

My improved door check, of which the two halves are shown respectivelyin Figs. l and 2, consists of sets of draw springs 1, 2, which impingeagainst an abutment 3, and surround two stationary tubes 4 and 5. Theopposite ends of the springs press against ears 6 and 7, provided upon acylinder 8, which cylinder has a head 9. The head 49 has a chamber 10,which connects by means of a duct 11 with the interior of the cylin--the same opening.

der 8. The head 9 is screwed into the cylinder 8 in such manner thatwhen the head is removeduthe cylinder can be properly bored fromltsleft-hand extremity, if so desired.

The chamber 10 has a ball valve l2, seated preferably upon a lead seat13, below which I provide a washer of fiber er similar material, all ofwhich parts forming the valve seat are then held in place by nfeans ofthe screw threaded nut 15. From this, it will be apparent that the ballvalve 12 permits fluid to enter the cylinder at its left-hand extremity,but prevents its return through A projection-16 prevents the ball fromclosing the aperture of the duct 11.

The cylinder is connected, by means of the bar 17, with a link18,'vvhich link, by means of a bolt 20, is pivotally fastened to thehinge 21. Suitable packing prevents egress of Huid through the opening,and accommodates the bar 17.

The entire door check is inclosed bya shell 23, which engages a portionof the abutment 3 at one end,'and is closed by a cap 24 at the otherend, thus to maintain the Huid in said door check proper. Then the dooris opened, the link 1S and arm 17 draw the cylinder S to the left,against the action of the draw springs 1 and 2, at the same timepermitting liquid or other suit-- able liuid, which fills the door checkup to. the lower edge of the tube 25, to enter the cylinder through thevalve 12. The precipitate return of the door, under the actuation of thesprings 1 and 2, is then prevented by a piston 26, fastened upon thepiston rod 2T, which piston rod is loosely mounted in a head 2S. Aspring 29 acting against the piston and the head serves to hold thepiston in its left-hand position. The piston rod which projects throughsaid head has a longitudinal'bore 30,. through which the liquid in thecylinder can pass through a nozzle 31, the opening of which nozzle iscontrolled by a valve 32; vvan adjustable rod 33 engaging said valve tohold the latter slightly away from its seat.

The face of the nozzle 31 has an annular groove 42 whereby I obtainabetter seat for the valve 32, and provide a place for the accumulationof foreign particles. The action of the draw springs tending to push thecylinder toward the right over the fixed -piston. 26 forces the liquidof A'the cylinder held in its through the hollow piston rod past the`valve 32 in a small quantity, so as to allow the door 'to close slowly.lllhe valve 32 is place by a screw 34 fastened in the head 28.

The rod extends through aLsuitable paul-ing 3d in the abutment 3, and isadjustably scrwed in sleeve 35 slidably mounted in said abutment;thereby providing an adjustable device -for shifting the rod to adjustthe position of the valve 3&2.l The sleeve is locked in position by thever tical arm 336 of a bell-crank lever 33a, 33". A spring 3G holds thevalve 32 againstits seat, 'which spring is held in place by a pin 37.The rod 33 has a hinged extremity 38 which serves the purpose ofpermitting the door to close more slowly as it approaches its closedposition. This is due to a projection 39 upon the ear 6, whichprojection, as the cylinder moves toward the lett, elevates theextension 38 hinged to said rod 33, so as to press the valve 39 fartheraway from its seat.

As the door approaches normal position, itwill be seen that theprojection 39 permits the lowering of the'hinge portieri of the rod 33,thereby reducing its effective length, and gradually bringing` the valve32 against. its seat to make the door close more slowly. he rod 33 andits extremity" 38 thus serve a dual purpose, making a perma-` nent adjustinent of the action oit the valve 32, and at the Sametime a Variableadjustment in the course of each operation.

The valve 32 has a curved or angularly disposed surface Ll0, whichengages the extremity 38 to more thoroughly permit of maints" thegradual adjustment of this Valve on its seat. I

While I have herein shown and part-icularly described the preferredembodiment ot' my invention, I do not limit myself to the preciseconstruction and arrangement as herein set forth, but y Having thusdescribed its most .salient features, what I claim as .new and desire tosecure by Letters Patent is:

1. In a door check and closer, the combination oi? a cylinder andpiston, means for permitting freev entrance of a luid to said cylinder,a shiftable valve for throttling the vescape ofiuid from lsaid cylinderand provided with an irregular surface, a hinged member engaging saidirregular surface of the valve, and means for swinging, said hingedmember to shift said valve.

2. In a door check and closer, the combination of a cylinder and piston,means :tor permi'f' ing free entrance of a fluid t-o said cylindev j, ahinged member, means forswing ing sauf hinged member, a shiftable valvefor throtglling the escape of fluid from said cylinder and provided`with an irregular surface, and resilient means for maintaining saidirregular valvesurface in yielding engagement with said hinged memberfor causing ununiform shifting of said Valve upon swing of said member.

In Witness whereof, I hereunto subscribe my name this 9th day of March,A. '4. 1910.

, 'run ERIK NoRDQt tsr.

Witnesses:

Hazan JONES, A. LYDA JONES.

